The most popular non-vegetarian (non-veg) shop in the world is subjective and challenging because preferences vary widely, and popularity can be measured in different ways. However, some globally recognized and popular non-vegetarian fast-food chains include:

McDonald's: Known for its iconic burgers, including the Big Mac and Quarter Pounder with Cheese, McDonald's operates in numerous countries around the world.

KFC: Famous for its fried chicken, KFC has a global presence and is widely popular for its distinct blend of herbs and spices.

Subway: While known for its sandwiches, Subway offers various non-vegetarian options such as meatball marinara, chicken teriyaki, and more.

Burger King: This fast-food chain is recognized for its flame-grilled burgers, including the Whopper.

Domino's Pizza: Although known for pizza, Domino's offers a variety of non-vegetarian toppings and sides, making it popular globally.